Delayed ettringite formation in heat-cured Portland cement mortars

摘要: Abstract A Portland cement mortar was subjected to elevated temperature curing at 100°C for 12 h and then stored under water room temperature. Expansions, attributable delayed ettringite formation, were found develop over a period of 1 year. Sulfate ions released the pore fluid temperatures, partly sorbed by C-S-H gel, evidently formed in outer products paste–aggregate transition zones during subsequent storage The results X-ray microanalyses implied that potential band formation had been established mortar. Investigations microstructural features backscattered electron imaging indicated expansion caused generation extension these bands. No evidence support an alternative mechanism based on homogeneous paste could be found.